Measurement of sodium ion concentration in undiluted urine with cation-selective polymeric membrane electrodes after the removal of interfering compounds
作者： Feyisayo Phillips , Kim Kaczor , Neel Gandhi , Bradford D Pendley , Robert K Danish
DOI: 10.1016/J.TALANTA.2007.06.011
关键词: Membrane 、 Ionophore 、 Sodium 、 Ion selective electrode 、 Chromatography 、 Sample preparation 、 Chemistry 、 Extraction (chemistry) 、 Urine 、 Solid phase extraction
摘要: The measurement of sodium ion concentration in urine can provide diagnostic information and guide therapy. Unfortunately, neutral-carrier-based ion-selective electrodes show a large positive drift loss selectivity undiluted urine. extraction electrically neutral lipids from the into sensing membrane was suggested as main source drift, consequent incorrect readings. In this work, (i) solvent-solvent extraction, (ii) membrane-immobilized solvent (iii) solid phase were used to remove interfering compounds samples. "cleaned" samples subsequently analyzed using calixarene (sodium ionophore X)-based, solid-contact, sodium-selective electrode flow-through manifold. solid-contact sensors had excellent stability cleaned an acceptable bias compared commercial clinical analyzers.
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